Shell script to back up SVN working copy changes

To copy items shown by svn status, one can use a simple script as following.

#!/bin/bash - 
set -o nounset                              # Treat unset variables as an error

# Displays the message, usage info and exits with error code 1
function my_usage()
{
    msg=$1
    [[ $msg ]] && echo $msg
    echo "Usage:
    ./$0 source_dir destination_dir
    source_dir          Source directory
    destination_dir         Destination directory"
    exit 1
}

# Returns dir name with trailing slash
function my_get_dirname()
{
    dir=$1
    if [[ ${dir:${#dir}-1:1} != '/' ]]; then 
        dir=$dir"/"
    fi
    echo $dir
}

src_dir=`my_get_dirname $1`
dst_dir=`my_get_dirname $2`
verbose=1

# Validate args
if [[ ! -d $src_dir ]]; then 
    usage "'$src_dir' is not a directory"
elif [[ ! -d $dst_dir  ]]; then 
    usage "'$dst_dir' is not a directory"
fi

# Remember current dir 
dir=`pwd`
cd $src_dir

# Loop through files and folders 
svn st | awk '{ print $2 }' | while read F
do
    if [[ $F != 'framework' ]]; then
        # Create directory, if not exists
        d=`dirname "$dst_dir$F"`
        if [[ ! -d $d ]]; then 
            mkdir -p "$d"
        fi

        # Copy file or directory
        if [[ -f $F ]]; then
            [[ $verbose = 1 ]] && echo "FILE $F"
            cp -f "$F" "$dst_dir$F"
        elif [[ -d $F ]]; then
            [[ $verbose = 1 ]] && echo "DIR $F"
            [[ ! -d "$dst_dir$F" ]] && mkdir -p "$dst_dir$F"
            cp -rf $F $dst_dir$F/../
        fi
    fi
done

# Go to the initial dir 
cd $dir

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